CN102589655A

CN102589655A - Correction method of measuring value for resistor-capacitor integrated water level sensor of solar water heater

Info

Publication number: CN102589655A
Application number: CN2011100095953A
Authority: CN
Inventors: 施新法; 胡建强
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-01-04
Filing date: 2011-01-04
Publication date: 2012-07-18

Abstract

The present invention discloses a correction method of measuring values for a resistor-capacitor integrated water level sensor of a solar water heater. The control process comprises the following steps: A) predetermining automatic correction conditions; B) waiting for starting of water supply function; C) judging whether the water level is not more than 95%; if yes, proceeding with the daily operating procedures; if not, proceeding with the next step; D) continuing to supply water to drown point c, and beginning to detect whether the resistance value between point c and point N is the minimum value; if yes, proceeding to the next step; if not, returning to the previous step; E) stopping water supply; F) judging whether error exists compared with the capacitance frequency value of water level kept previously of the point c; if not, returning to wait for the water supply function; if yes, proceeding to the next step; G) replacing the capacitance frequency value kept previously of the point c; and H) automatically correcting the frequency value of the capacitance of the other water level in proportion, returning to wait for the water supply function to start the program. By adopting the above correction method, the solar water heater has advantages of being scientific and reasonable in structure, high in resolution, strong in control capability, small in scale effect, long in service life, etc.

Description

The integrated level sensor measured value of solar water heater resistance capacitance modification method

Technical field

The present invention relates to a kind of solar water heater intelligent monitoring technology, particularly a kind of computer that utilizes shows the integrated level sensor measurement of controller correction resistance capacitance solar water heater water storage tank level measuring value method.

Background technology

As everyone knows, the condenser type level sensor is made according to capacitance principle, and electric capacity is made up of two-plate and intermediate medium; Change intermediate medium and will change electric capacity, it is high more that water floods sensor as the medium of hollow electric capacity, and electric capacity is just big more; And can be linear change along with fluctuation in stage; Can detect the water level in the water storage tank through the frequency size that detects after electric capacity is changed, particularly convenient, as shown in Figure 1 on water level or automatic control of liquid level; Have that cost is low, resolution is high, adjusting function is many, it is little influenced by incrustation, the advantage that serviceable life is long especially.

But; The condenser type level sensor is on solar water heater uses; Because solar water heater water storage tank inner bag diameter has only 300 millimeters retrievable capacitance variations values only about 150P usually; Temperature in the environment for use, humidity, change of water quality are big in addition, if want that higher apparent control precision is arranged, it is particularly important that the accuracy of its measured value and stability seem.Yet; The condenser type level sensor exactly exists fatal defective in this respect; The firstth, it is very poor to receive assembly technology to influence the initial value consistance of its structure capacitive; Need at random the capacitance in zero level and full water site is preestablished, the moist degree difference of sensor in the time of can measuring, field environmental condition are different, and its predetermined value also is difficult to guarantee the accuracy next time measured; The secondth, condenser type level sensor temperature characterisitic is poor, receives medium temperature and ambient temperature effect in the use, and the initial value of its structure capacitive also can and then become big or diminish; The 3rd is to use the high-temperature steam that receives after a period of time in the solar water heater water storage tank to influence, sensor is whole initial value that tide becomes its structure capacitive of back takes place also can be increasing, measuring error can reach more than 20%; When above-mentioned phenomenon takes place after; Although the linear relationship of electric capacity and height of water level can not change; Because predetermined measurement constant and actual capacitance value are inconsistent; Computer shows that water level and actual water level that controller is got have very large error, and mistake control or accident out of control can take place again and again, causes the condenser type level sensor on solar water heater, not have actual use value.The invention notification number is the patented product of CN1587159; Has quantitatively preset zero offset capability of level measuring value time; He is under the situation that extraneous water conditions is fine and user's operation technique level is high, to be basic feasible solution; Be that certain use value is arranged, the water supply but oneself drilling water pump of some rural area draws water, having the waterworks to supply water, undesired, pipeline and water storage tank and the installation of sun power water storage tank height are unreasonable causes the situation that water supply pressure is low, flow is thin.Just be bound to cause domestic consumer normally not use in this technology of using the patented product of invention notification number CN1587159 to explain; It is very low and be shown as high temperature, high water stage on the master control appearance summer particularly to occur in the actual sun power water storage tank water level; Cause sun power water storage tank inner cold water to be rushed in suddenly owing to the master control appearance is out of control and cause vacuum tube shrinkage explosion, the serious consequence of water storage tank shrinkage deformed damaged.Why is this? Research can learn it is that the invention notification number is that the patented product modification method imperfection of CN1587159 causes mistake correction, the result after adding up for a long time through long-term scientific practice.

Shown in Figure 2; When water storage chest (6) pondage deficiency, master control appearance (3) control electromagnetic valve (5) can only make water storage tank (4) go up water to 90% water level; Use the invention notification number to be the CN1587159 patented product; Will revise the level measuring value automatically, water storage tank (4) water level is shown as 100% on master control appearance (3) as a result, and (5) are carried out and stopped to go up water function.Analogue through for a long time repeatedly after, it is very low sun power water storage tank actual water level to occur, and is shown as 100% on the master control appearance, causes and can't use.

Summary of the invention

For overcoming existing condenser type level sensor and the notification number above-mentioned defective for the existence of CN1587159 patented product, problem to be solved by this invention provides a kind of method of coming the integrated level sensor measured value of automatic correction resistance capacitance to depart from through the control in real time of computer demonstration controller.The integrated level sensor of the technical solution adopted for the present invention to solve the technical problems resistance capacitance comprises the integrated probe measurement circuit of resistance capacitance; And be installed on the water storage tank of solar water heater; The output terminal of metering circuit shows that with computer controller sensor input end is connected, and described computer demonstration controller is measured dual control in real time to the water storage tank water level of measuring through the integrated level sensor of resistance capacitance; Automatically revise, its control flow carries out as follows:

A, preset automatic correction conditions;

Water function starts in B, the wait;

C, whether go up water level≤95%; If get into the day-to-day operation program; If, do not get into next step;

Water is to flooding the c point in D, the continuation, and begins to detect that resistance value is a minimum value between the c point N point; If get into next step; If, do not return a step;

E, stop to go up water;

Whether F, the c point water level electric capacity frequency values of depositing with previous meter have error; Wait for upward water function if not, return; If get into next step;

The electric capacity frequency values that G, the previous meter of replacement c point are deposited;

H, revise the electric capacity frequency values of other water level point automatically in proportion, turn back to and wait for and go up water function.

Description of drawings

Fig. 1 structural representation.

Fig. 2 scheme of installation.

Claims

1. the integrated level sensor measured value of this solar water heater resistance capacitance modification method; 1. the integrated level sensor of resistance capacitance comprises the integrated sensor probe of resistance capacitance; 2. metering circuit is installed on the water storage tank of solar water heater, and metering circuit output terminal 2. and master control appearance 3. sensor input end are connected; It is characterized in that: 3. alphascope is monitored the water storage tank water level of measuring through the integrated level sensor of resistance capacitance in real time; Dual control is revised automatically, and its control flow following steps are carried out:

A, preset automatic correction conditions, oscillation frequency value when designated water level check point and corresponding capacitance, the D point is the zero level point, the C point is the full water site, can set the water level detecting point of respective numbers according to detecting the demonstration needs;

B, preset full water site C are maximum capacitor value and minimum resistance coincide point, and water function starts in the wait;

C, begin to go up water, sensed water level whether≤95%, if continue the day-to-day operation program; If, do not get into next step;

Water makes it flood the C point in D, the continuation, detects whether resistance value is minimum value between C point and the N point, if get into next step; If, do not return a step;

E, stop to go up water;

More whether F, the current electric capacity frequency values of detection have error with the C point water level electric capacity frequency values that previous meter is deposited; If error is within allowed band, former C point storage data remain unchanged, and do not revise; Turn back to and wait for upward water function, exceed allowed band if detect electric capacity frequency values error;

The electric capacity frequency values that G, the previous meter of replacement C point water level are deposited;

H, revise the electric capacity frequency values of other water level detecting point automatically in proportion, turn back to and wait for and go up water function.